Electrolytic meter.



G. 'HOOKHAM-& S. H. HOLDEN.

ELEGTROLYTIG METER.

APPLICATION FILED JUNE 1, 1908.

' Patented Apr. 27, 1909.,

GEORGE HOOKHAM AN'D SYDNEY HOLMWOOD HOLDEN, OF BIRMINGHAM, ENGLAND.

ELECTROLYTIC METER.

Specification of Letters Patent.

Patented April 27, 1909.

Application filed June 1, 1908. Serial No. 435,915.

To all whom it may concern:

Be it known that we, GEORGE I-IOOKHAM, and SYDNEY HOLMWOOD HOLDEN,SIJbJGCtS of the King of Great Britain and Ireland, and residing at 4New Bartholomew street, Birmingham, in the county of Warwick, Eng-'land, have invented certain new and useful Improvements in ElectrolyticMeters, 01" which the following is a specification.

Our invention relates to electrolytic meters of the hermetically sealedtype'and has for its object to so construct such meters'that their rangeand accuracy is increased.

A hermetically sealed electrolytic meter of the type referred toconsists of an electrolytic cell having an anode capable of absorbinghydrogen or other gas and placed partly in the electrolyte and partly incontact with the hydrogen or other gas to be absorbed, the cathode inthe said meter being wholly immersed in the electrolyte.

The present invention consists in inclosing the cathode in a smallchamber or bulb which communicates with the tube in which the gas givenoff at the cathode is measured so that the cathode is always in contactwith an atmosphere of gas above the electrolyte.

The invention further consists in the improved electrolytic meterhereinafter described.

Referring to the accompanying drawings, Figure l is a sectionalelevation of a meter constructed according to our invention, Fig. 2being a front elevation with the cover removed. Fig. 3 being an enlargedview of the bulb containing the cathode.

In the meter illustrated the .electrolytic cell consists of a bulb, I),connected to the lower end of a measuring tube, d, which is sealed afterthe. admission of the electrolyte. The electrolyte used may be dilutesulfuric acid containing 10% of the acid the quantity used beingsufficient to fill the measuring tube andabout half the bulb. The anode,a, consists of a piece of platinum gauze preferably coated with latinumblack and supported across the bu b by platinum wires one or more ofwhich may form one terminaloi" the cell. a

At the lower end of the measuringtube and in communication therewiththere is provided a small chamber, or bulb, 0, containing the cathode,e, formed of a spirally twisted loop of platinum wire which enters nearthe lower end of the small chamber, 0, and projects above the passage,f, connecting the chamber 0, with the measuring tube, (1, so that theupper end of this cathode, 6, always projects into an atmosphere of thegasto be'measured;

The cell may be conveniently mounted on a hinge n in a box, 9, carryinga shunt coil,

h, and a resistance 7c, in series with the cell, the resistances, h,'7c,being made of the same material which should have a small temperatureco-eflicient preferably platinoid or German silver so that temperatureerrors are avoided.

In order to set the meter to zero the cell is tilted so that themeasuring tube is filled with liquid, the tube is then replaced in thevertical position to collect the gas given off at the cathode, the gasgiven off at the anode being absorbed. 4 By placing the cathode in aseparate chamber as above described the range and accuracy of the meteraregreatly increased.

Havingnow described our invention what we claim as new and desire tosecure by Letters Patent is 1. An electrolytic meter having a storage ofgas and an anode capable ol' absorbing the said gas, said'anode'beingpartly immersed in electrolyte and partly in the storage of gas, and acathode also partly immersed in the electrolyte and partly in gas, asset forth.

- 2. An electrolytic meter having a chamber partially filled withelectrolyte, a measuring tube connected at its lower end to saidchamber, a small chamber in communication with said measuring tube, ananode in said first mentioned chamber and a cathode in said smallchamber, as set forth.

In testimony whereof, we aflix our signatures in presence of twowitnesses.

GEORGE HOOKHAM. SYDNEY HOL'MWOOD HOLDEN.

Witnesses:

WILLIAM HORTON,- BERTIE HoeARTH.

